Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
1998-03-02
2001-02-20
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C166S105000, C166S105500
Reexamination Certificate
active
06190141
ABSTRACT:
TECHNICAL FIELD
This invention relates in general to electrical submersible well pumps, and in particular to a centrifugal pump with injection ports for injecting fluids to reduce viscosity of the well fluid being pumped. More particularly, the device is useful in wells producing heavy oil, where reducing fluid viscosity is especially important.
Related art devices have been used to distribute a chemical below a submersible pump. An example of such a device is described in U.S. Pat. No. 4,582,131, which utilizes a secondary pump for injecting chemicals below the motor. The secondary pump has an intake connected to an intake tube that extends upwardly above the intake of the primary pump. Chemicals introduced into the annulus at the surface flow down the annulus and into the intake tube and are discharged below the motor. Another device, described in U.S. Pat. No. 4,749,034, is a well pump assembly that has a tube extending into a well for delivering water to a point below the pump for reducing viscosity of oil being pumped.
SUMMARY OF THE INVENTION
According to the present invention, a centrifugal pump for use in an electrical submersible well pump assembly is provided that includes a submersible pump having impellers for displacing well fluid and an inducer attached to the pump for inducing well fluid to flow into the impellers. One or more injection ports are provided in a sidewall of the pump proximate to the inducer for injecting diluent into the pump for mixing diluent with well fluid. The diluent is fed to the injection port by an injection line that transmits fluid from an injection pump on the surface into the submersible pump. Preferably, a plurality of injection ports are positioned radially about the submersible pump and are in communication with an annular interior chamber for injecting diluent into the pump for mixing with well fluid. Additionally, it is preferred that the injection ports are positioned along a length of the inducer so that diluent is mixed with well fluid in the inducer. The inducer is preferably a helical screw pump. It is preferred that the pump is comprised of a pump section and a pump base, wherein the pump base houses the inducer.
In practice, diluent is transferred via one or more injection lines from ground level to injection ports positioned radially about the pump. Diluent is injected into the pump so that the diluent is acted upon by an inducer and mixed with well fluid to form a mixture.
REFERENCES:
patent: 2214064 (1940-09-01), Niles
patent: 4025238 (1977-05-01), Masclet
patent: 4481020 (1984-11-01), Lee et al.
patent: 4582131 (1986-04-01), Plummer et al.
patent: 4749034 (1988-06-01), Vandevier et al.
patent: 5000264 (1991-03-01), Snider
patent: 5516360 (1996-05-01), Normandeau et al.
Baker Hughes Incorporated
Bradley James E.
Felsman, Bradley, Vaden, Gunter & Dillon L.L.P.
Freay Charles G.
Torrente David J.
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